問題：

使用ffmpeg發(fā)現(xiàn)av_malloc申請的內(nèi)存最后不能用av_free函數(shù)釋放，會崩潰。

代碼示例：

unsigned char * iobuffer = NULL; iobuffer = (unsigned char *)av_malloc(40000);if (iobuffer == NULL){printf("iobuffer av_malloc failed.\n");return -1;}AVIOContext *avio = avio_alloc_context(iobuffer, 40000, 0, this, fill_iobuffer, NULL, NULL);if (avio == NULL){printf(" avio_alloc_context failed.\n");return -1;}/*.........*/

釋放avio_alloc_context的內(nèi)存

方法1：使用avio_context_free

avio_context_free(&avio );

方法2：使用av_freep

// 釋放內(nèi)存av_freep(&avio ->buffer);av_freep(&avio);

附錄：

/*** Free the supplied IO context and everything associated with it.** @param s Double pointer to the IO context. This function will write NULL* into s.*/ void avio_context_free(AVIOContext **s);/*** Free a memory block which has been allocated with a function of av_malloc()* or av_realloc() family, and set the pointer pointing to it to `NULL`.** @code{.c}* uint8_t *buf = av_malloc(16);* av_free(buf);* // buf now contains a dangling pointer to freed memory, and accidental* // dereference of buf will result in a use-after-free, which may be a* // security risk.** uint8_t *buf = av_malloc(16);* av_freep(&buf);* // buf is now NULL, and accidental dereference will only result in a* // NULL-pointer dereference.* @endcode** @param ptr Pointer to the pointer to the memory block which should be freed* @note `*ptr = NULL` is safe and leads to no action.* @see av_free()*/ void av_freep(void *ptr);

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